Features: Advanced Health Monitoring: The Smart Rings tracks heart rate, blood oxygen levels, stress levels, and sleep quality seamlessly, ensuring you stay informed about your health status effortlessly. Water Resistance: With a 5ATM and IP68 water resistance rating, the rings can be worn worry-free in various conditions, including swimming and showering. Real-Time Exercise Monitoring: Supports multi different exercise modes, providing real-time heart rate data during workouts to help optimize your fitness routine. No Display Screen: The smart rings operates without a display screen, focusing on seamless, unobtrusive health monitoring. Stylish and Innovative: Combines cutting-edge technology with a stylish design, making it a perfect accessory for health-conscious individuals. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Product weight: 4.5g Applicable systems: Androids 5.0 and above, IOS 10.0 and above Rings diameter: 7: 17.4mm 8: 18.2mm 9: 19mm 10: 19.9mm 11: 20.7mm 12: 21.5mm Package List: 1x Smart Rings